package com.sjgtw.cloud.gateway.handler;

import org.springframework.cloud.gateway.support.NotFoundException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import com.alibaba.fastjson.JSON;
import com.sjgtw.cloud.common.core.domain.R;
import reactor.core.publisher.Mono;

/**
 * <p>Title: Gateway-网关异常全局拦截</p>
 * <p>Description: </p>
 * @author Admin
 * @date 2021-4-9
 */
@Order(-1)
@Configuration
public class GatewayExceptionHandler implements ErrorWebExceptionHandler
{
	private static final Logger log = LoggerFactory.getLogger(GatewayExceptionHandler.class);

	@Override
	public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
		ServerHttpResponse response = exchange.getResponse();

		if (exchange.getResponse().isCommitted()) {
			return Mono.error(ex);
		}

		String msg;

		if (ex instanceof NotFoundException) {
			msg = "服务未找到！";
		} else if (ex instanceof ResponseStatusException) {
			ResponseStatusException responseStatusException = (ResponseStatusException) ex;
			msg = responseStatusException.getMessage();
		} else {
			msg = "内部服务器错误！";
		}

		log.error("[网关异常处理]请求路径:{},异常信息:{}", exchange.getRequest().getPath(), ex.getMessage());

		response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
		response.setStatusCode(HttpStatus.OK);

		return response.writeWith(Mono.fromSupplier(() -> {
			DataBufferFactory bufferFactory = response.bufferFactory();
			return bufferFactory.wrap(JSON.toJSONBytes(R.fail(msg)));
		}));
	}
}